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Investments - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 1,760,030 | $ 1,754,039 | [1]
Investments, Excluding Short-Term Investments |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | 1,749,161 | 1,666,122 |
Short term investments |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 10,869 | $ 87,917 | [1]
Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 100.00% | 100.00% |
Investments at fair value | Geographic Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 100.00% | 100.00% |
United States |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 1,739,866 | $ 1,653,615 |
United States | Investments at fair value | Geographic Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 99.50% | 99.30% |
Canada |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 7,452 | $ 8,739 |
Canada | Investments at fair value | Geographic Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 0.40% | 0.50% |
Cayman Islands |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 1,179 | $ 2,998 |
Cayman Islands | Investments at fair value | Geographic Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 0.10% | 0.20% |
Bermuda |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 664 | $ 770 |
Bermuda | Investments at fair value | Geographic Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 0.00% | 0.00% |
Services: Business |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 336,055 | $ 240,316 |
Services: Business | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 19.20% | 14.40% |
Healthcare & Pharmaceuticals |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 237,082 | $ 250,049 |
Healthcare & Pharmaceuticals | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 13.60% | 15.00% |
Media: Diversified & Production |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 134,927 | $ 139,399 |
Media: Diversified & Production | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 7.70% | 8.40% |
Services: Consumer |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 115,849 | $ 119,365 |
Services: Consumer | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 6.60% | 7.20% |
Media: Advertising, Printing & Publishing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 105,375 | $ 94,610 |
Media: Advertising, Printing & Publishing | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 6.00% | 5.70% |
Diversified Financials |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 99,819 | $ 101,032 |
Diversified Financials | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 5.70% | 6.10% |
Retail |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 74,718 | $ 56,726 |
Retail | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 4.30% | 3.40% |
Energy: Oil & Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 68,756 | $ 32,164 |
Energy: Oil & Gas | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 3.90% | 1.90% |
Chemicals, Plastics & Rubber |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 66,753 | $ 109,860 |
Chemicals, Plastics & Rubber | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 3.80% | 6.60% |
Consumer Goods: Durable |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 60,735 | $ 58,124 |
Consumer Goods: Durable | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 3.50% | 3.50% |
High Tech Industries |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 56,501 | $ 65,544 |
High Tech Industries | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 3.20% | 3.90% |
Consumer Goods: Non-Durable |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 47,886 | $ 45,682 |
Consumer Goods: Non-Durable | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 2.80% | 2.70% |
Hotel, Gaming & Leisure |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 46,739 | $ 50,855 |
Hotel, Gaming & Leisure | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 2.70% | 3.00% |
Construction & Building |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 46,007 | $ 27,585 |
Construction & Building | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 2.60% | 1.70% |
Beverage, Food & Tobacco |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 45,396 | $ 49,054 |
Beverage, Food & Tobacco | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 2.60% | 2.90% |
Banking, Finance, Insurance & Real Estate |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 43,836 | $ 40,634 |
Banking, Finance, Insurance & Real Estate | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 2.50% | 2.40% |
Capital Equipment |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 41,580 | $ 82,795 |
Capital Equipment | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 2.40% | 5.00% |
Aerospace & Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 38,842 | $ 38,279 |
Aerospace & Defense | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 2.20% | 2.30% |
Containers, Packaging & Glass |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 19,551 | $ 0 |
Containers, Packaging & Glass | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 1.10% | 0.00% |
Telecommunications |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 18,302 | $ 24,649 |
Telecommunications | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 1.10% | 1.50% |
Automotive |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 16,255 | $ 14,367 |
Automotive | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 0.90% | 0.90% |
Metals & Mining |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 15,780 | $ 10,927 |
Metals & Mining | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 0.90% | 0.70% |
Transportation: Cargo |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 12,417 | $ 14,106 |
Transportation: Cargo | Investments at fair value | Industry Concentration |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Investment Portfolio | 0.70% | 0.80% |
[1] | Fair value determined in good faith by the Company’s board of directors (see Note 9) using significant unobservable inputs unless otherwise noted.

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